The hair on the pubic bone mainly refers to pubic hair, and the causes of pubic hair falling out include androgenic factors, folliculitis, trauma and so on. 1. Androgenic factors: due to various factors leading to an abnormal increase in androgens, at this time can be triggered by hair follicle miniaturization, which may trigger the loss of pubic hair. 2. Folliculitis: due to bacteria and other microorganisms infecting the hair follicles, these microorganisms will trigger the inflammatory reaction of the hair follicles, inflammatory factors damage to the hair follicles, hair follicle damage can lead to the loss of pubic hair. 3. Trauma: If the skin on the pubic bone is damaged by external force, the hair follicle will be necrotic and the hair root will fall off, which will finally lead to the phenomenon of losing pubic hair. Please go to the hospital in time to check the phenomenon of pubic hair loss or even fall out, after clarifying the cause of the disease under the guidance of the doctor to treat the symptoms.